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Delayed bleeding refers to the phenomenon that the concrete initially meets the requirements, but after a period of time (such as 1h), a large amount of bleeding occurs.

Under the same conditions of slump and 28d strength, the performance of fly ash concrete is compared with that of ordinary concrete as follows:

Surface bubbles in concrete construction have a direct impact on the performance of concrete. When the content of bubbles in concrete is less than 4% and the particle size is less than 0.5mm, the a...

Although the influence of sand rate on the strength is not as obvious as the water-binder ratio, the sand rate will have a certain influence on the concrete, and its influence degree is related to ...

Polycarboxylate superplasticizer is a high-performance water-reducing agent that is commonly used in the construction industry. It is a type of water-soluble polymer that is known for its excellent...

From the perspective of concrete production, the quality of concrete should be controlled from the aspects of raw materials, mix design, production control, transportation and delivery to ensure th...

Polycarboxylic acid water reducer has low content, high water reduction rate and good slump, but the following problems also appear in application:

Concrete cracks are the physical structural changes of concrete structures due to internal and external factors, and cracks are the main reasons for the reduction of bearing capacity, durability an...

In recent decades, the research work on crack prevention and control in concrete engineering has not stopped, but the crack problem has not been effectively solved.

(1) The concrete mixing is not good (2) Poor transportation conditions (3) Improper pouring method (4) serious leakage of formwork (5) molding vibration is not dense (6) Poor maintenance system

Loss is inevitable, the important thing is how to reduce the loss value to the minimum, the loss speed to the slowest, the smallest, to facilitate the smooth construction. The technical measures t...

The change of concrete raw materials will have a great impact on concrete production, concrete related enterprises should be fully prepared to deal with these changes.